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  1. #include <stdio.h>
  2. #include <stddef.h>
  3.  
  4. int main(void) {
  5.     int a[20] = {0};
  6.     int *p = &a[3];
  7.     int *q = &a[13];
  8.     ptrdiff_t diff1 = q - p; // This is 10
  9.     char *x = (char*)p;
  10.     char *y = (char*)q;
  11.     ptrdiff_t diff2 = y - x; // This is 10 times sizeof(int)
  12.     printf("diff1=%d, diff2=%d\n", (int)diff1, (int)diff2);
  13. 	return 0;
  14. }
  15.  
Success #stdin #stdout 0s 2168KB
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stdin
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Standard input is empty
stdout
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diff1=10, diff2=40
https://ideone.com/RrgIkh
language:
C99 (gcc 8.3)
created:
8 years ago
visibility:
public

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